Statement-based events are ignored, but row-based events are processed for
each volume value, checking the column type,
isBlob() method and then truncating the contents
when they are identified as larger than the configured length. To confirm
the type, it is compared against the Java class
com.continuent.tungsten.replicator.extractor.mysql.SerialBlob,
the class for a serialized BLOB
value. These need to be processed differently as they are not exposed as a
single variable.